Anylink drop down menu horizontal line problem in Firefox

[Jacquic]

1) Script Title: AnyLink Drop Down Menu

2) Script URL (on DD): Not sure source just says
AnyLink Drop Down Menu- © Dynamic Drive (www.dynamicdrive.com)

3) Describe problem: This drop down menu works fine on IE but a client looking at it with Firefox (on a Mac) says that the horizontal line that separates the drop down menu headings extends past the vertical box on the right hand side.

Temporary working site is at: www.jacquicallis.co.uk/suelie/

Thanks to anyone who can help.

JC

[Jacquic]

Think I have solved this now but glad to have found this forum.
JC